Page 108: of Maritime Reporter Magazine (September 1993)

POWER many for P&O Cruises. Main pro- pulsion is by four MAN B&W me- dium-speed engines of the largest L 58/64-type, one with nine cylinders and one with six cylinders, totalling 39,750 kW (54,060 bhp) and coupled to each Lips cp propeller through

Renk Tacke reduction and combin- ing gears. A two-ratio power take-off system on the pinion shaft for each of the smaller engines provides for driv- ing a 4,200 kW generator at sea, and in harbor if necessary. It will also allow these generators, when switched to operate as 4,000 kW motors supplied from the ship's 16

MW independent generating station, to supplement the output of the main propulsion engines on the few occa- sions when maximum speed is re- quired. This will save the first cost of some main engine cylinders and provide exceptional flexibility, with a power management system able to select for optimum economy from a permutation of diesel engines of about 12 MW and eight MW, and the four-MW motor.

The first merchant ship type to be fitted with SSS-Tosi hydrodynamic reversing gear is now at sea. This is The MTU 16V 396 TE94 diesel. the U.S.S. Supply, lead of a class o fast combat support ships of the U.S

Navy. They have the same outfit o: prime movers as the 31-strong

Spruance-class destroyers: four Gen- eral Electric LM2500 gas turbines, driving two propellers. There the similarity ends, because while the destroyers have Bird Johnson-

KaMeWa cp propellers, the support ships have fixed-pitch propellers and

Cincinnati locked-train double-re- duction gears which incorporate a maneuvering train with an SSS-Tori reversible converter coupling. This is a hydraulic turbo-type coupling in which it is possible to insert or re- tract a series of radial blades be- tween the input and output cups.

These blades have a profile which reverses the direction of the fluid issuing from the driving half so that the driven half rotates in the oppo- site direction. To date, the aircraft- carrier Garibaldi of the Italian Navy (also with four LM2500s) has been the only ship at sea with this trans- mission, which enables a highly- loaded shaft to be reversed with as- tonishing rapidity.

The new generation of very large, fast and weight-sensitive dynami- cally-supported SWATH-type and monohull ferries require reduction gears of light construction to trans- mit high powers from gas turbines to water jets. Renk Tacke GmbH supplied three-stage vertically- stacked C-form gears, to transmit 15,000 kW from MTU-GE 1600 gas turbines, with a speed reduction of 7,000/652 rpm to KaMeWa water jets in the trans-Atlantic record- breaker Destriero. Drive-through gears connect two of the new MTU 595 engines and a MTU-LM 2500 gas turbine to the water jets of the 40-knot Aquastrada-type 350-pas- senger and 150-car ferry Guizzo mentioned earlier.

MAAG Gear Co. of Zurich have recently begun the manufacture of lightweight gears suited to gas tur- bine drive. The double-reduction vertically-stacked MGO-llO/2 gear sets for the Kvaerner Fjellstrand

Foil Cat have a steel center section carrying the secondary and output shafts, with light alloy upper and lower casings. They reduce the in- put speed from 6,600 rpm to 904 rpm. A recent major success is the order for the gears transmitting a total of 60 MW in each of the Stena

High Speed Sea Service ferries.

Water Jets

The water jet has emerged as the most effective propulsor for fast light draft vessels, where a conventional

Gulf Coast's best bet for repair is now even better.

For more than 70 years, Bender has been the leading ship repair facility on the central Gulf of Mexico. Now, we're even better.

Along our 7,000 feet of deep water frontage, we've built new yards and wet docks, improved equipment, and added dry docks to raise lifting capacities to 20,000 tons. These modern Panamax facilities and an around-the-clock workforce put muscle behind our promise of fast, reliable ship repair. Now, more than ever, Bender is your best bet for ship repair on the Gulf of Mexico.

BENDER

SHIPBUILDING & REPAIR CO., INC. 265 South Water Street • Mobile, Alabama 36603 USA • P.O. Box 42 • Mobile, Alabama 36601 USA • (205) 431-8000 • FAX (205) 432-2260 • Telex 505457

Circle 217 on Reader Service Card

A New Departure From The

RIB Industry By Boston Whaler.

A departure into a world where the new Impact 21' soft-sided workboat is the only accept- able platform for operations which demand soft-sides but cannot afford the downtime associated with traditional inflatable collars.

A world where

Boston Whaler's new soft-sided workboat is clearly the best choice for hard work and hard use with a fendering system that sustains incredible abuse but never deflates.

Impact 21' combines the unsinkable, vir- tually indestructible

Boston Whaler foam cored hull with a fully fitted foam collar. This unique fendering system provides full time protection against punctures and abuse of all kinds, and will not deflate. Step into the new world of soft-sided boats.

Impact 21' by

Boston Whaler.

IMPACT " 21', THE

SOFT-SIDED WORKBOAT.

Boston Whaler Impact Series - The Best Boats For The Worst lobs.

BOSTON WHALER, INC., COMMERCIAL PRODUCTS DIVISION 1149 Hingham St., Rockland, MA 02370 Tel: (617) 871-1400, Ext: 315 • Fax:(617)878-4916

Circle 318 on Reader Service Card 102 Maritime Reporter/Engineering News